Question

I have a ASP.NET Application and a MySQL Database. I want write a Class to insert,delete and show the Data from the database. I have a Connection to the Database but I can’t insert data in the database.

My Class insert method:

public string CreateEntry(string Connectionstring, string mitarbeiter)
{
    connection = new MySqlConnection(Connectionstring);
    try
    {
        var command = connection.CreateCommand();
        command.CommandText = "INSERT INTO tb_mitarbeiter (Vorname) VALUES ('tom')";
        connection.Open();
        return "Mitarbeiter wurde angelegt";
    }
    catch (Exception ex)
    {
        return ex.Message;
    }
    finally
    {
        connection.Close();
    }
}

The Connectionstring is correct. I don’t get a error but there is no data in the database.

My tablename: tb_mitarbeiter
columns: ID and Vorname

Answer 1

You should simply execute the command

....
MySqlCommand command = connection.CreateCommand();
command.CommandText = "INSERT INTO tb_mitarbeiter (Vorname) VALUES ('tom')";
connection.Open();
command.ExecuteNonQuery();
....

I suppose that mitarbeiter is the real value that should be set in the database.
If this is the case remember to use parameters to insert/update your data

MySqlCommand command = connection.CreateCommand();
command.CommandText = "INSERT INTO tb_mitarbeiter (Vorname) VALUES (?name)";
command.Parameters.AddWithValue("?name", mitarbeiter);
connection.Open();
command.ExecuteNonQuery();